Marking machine



Aug. 9, 1938. R. B. WCODCOCK ET AL MARKING MACHINE 4 Sheets-Shet 1 Filed March 19, 1937 Aug. 9, 1938.

R. a. WOODCOCK ET AL v MARKING MACHINE Filed March 19, 1 957 4 Sheets-Sheet 2 g- 9, 1938- R. B. WOODCOCK E1- AL 2,125,975

MARKING MACHINE Filed March 19, 1957 4 Sheets-Sheet 3 Patented Aug. 9, 1938 UNITED STATES PATENT OFFICE MARKING MACHINE.

Application March 19, 1937, Serial No. 131,898 In Great Britain April 14, 1936 23 Claims.

This invention relates to marking machines and is herein illustrated with reference to a machine of the type adapted for use in making identification marks upon articles of apparel, although it is to be understood that the invention may have application in connection with the marking of any article.

One type of machine for this purpose commonly includes a work support and a marking head which are relatively movable toward each other to press a marking strip, extending between the support and head and having marking medium on its side adjacent to the work support, intoengagement with the work whereby the marking medium is transferred from the strip to the work in a configuration conforming to that of the characters on the marking head. Usually, although not necessarily, the marking head comprises a heated die which may be in the form of an engraved plate or a plurality of interchangeable type which may be reset whenever it is desired to change the mark.

It is a general object of the present invention to provide an improved machine of the type referred to above which afiords better visibility and accessibility to the work support and marking head than has been attained in prior machines. To this end, the marking strip in the illustrated machine is normally supported so as to extend at a substantial inclination diverging from the work support toward the front thereof but is adapted to be carried by a movable guide into proximity to the Work support before the strip is engaged by the marking head. Thus a relatively wide gap exists between the marking strip and the work support at the time when the workpiece is placed on the support without impairing the effectiveness of the marking head because the above-mentioned guide is operated to move the m piece which is substantially parallel to the marking head before the latter engages the strip so that all portions of the characters on the marking head will be brought to bear with equal pressures on the marking strip and for the same length of time.

Resetting of the type pieces in the marking head of the illustrated machine is facilitated by moving the marking head into a type-resetting position well above the guide such that the type are gravitationally held in the head, and in accordance with another feature of the invention the marking strip and the holder upon which the forward end of the marking strip is stored 55-" are lowered, simultaneously withthe above-menmarking strip into engagement with the work l0 ing the marking head from being unintentionally operated toward and away from the work support before the head has been returned to its startingv position after a type-resetting operation.

These and other features of the invention will be apparent from the following detailed description read in. connection with the accompanying drawings and will'be pointed out in the claims.

Fig. 1 is a side elevation of an illustrative machine in which the invention is embodied;

Fig. 2 is an elevation of the side of the machine opposite to that shown in Fig. 1;

Fig. 3 is a fragmentary side elevation of the front portion of the machine illustrating the marking head in its type resetting position;

Fig. 4 is a front elevation of the mechanism illustrated in Fig. 3;

Fig. 5 is a sectional view of latching means for holding the marking head in the type-resetting position, the section being taken along the line VV in Fig. 2; and

Fig. 6 is a sectional view of a portion of a marking strip feeding mechanism, the section being indicated by the line VI-VI in Fig. 2.

The illustrated. machine comprises a frame In (Figs. 1 and 2) in the forward lower part of which is mounted a work support l2 adapted to support a work-piece against the pressure of a marking head M which is arranged to be moved toward the support [2 to press a marking strip l6 having a coating of marking medium thereon against the work in order to impart thereto a printed impression of the characters on the marking head. M. The work support I2 is mounted for movement toward and away from the marking head M to accommodate different thicknesses of work and is thus adjusted by turning a hand nut l8 into which is threaded the stem' of the work support which extends downwardly into the frame It]. The positioning of the work on the work support I2 is facilitated by spring pins 20 which are arranged to yield downwardly under the influence of the marking head M in ordernot to interfere with its movement. The marking head- 14 is removably mounted by means 01 dovetailed connections 22 in a carrier 24 arranged to receive electric heating elements 26 and mounted on a shaft 28 to swing upwardly and forwardly away from the support I2 into a convenient position, to be termed hereinafter the type-resetting position, to facilitate the changing of the type in the marking head I4, as will be described later. The shaft 28 is fixed to the forward'side of a slide 30 mounted for vertical movement in guideways 32 formed in an extension of the frame I!) overhanging the work support I2. The slide 30 is moved to operate the marking head I4 toward and away from the work support by connections comprising a lever 34 pivoted at 35 to the slide 30 and arranged to rock about a fulcrum 33 at the upper end of a link 3'! pivoted at 38 to the frame Iii. The lever 34 is operated from a drive shaft 48 (Fig. 1) having an eccentric 42 by a telescoping connecting rod comprising an eccentric strap 44 which surrounds the eccentric 42' and is bored to receive a rod 46 connected by a ball-andsocket joint 48 to the lever. A yielding connection between the rod 48 and the strap 44 is provided by a lever 50'pivoted at 52 on the eccentric strap 42, the lower end of this lever being adapted to bear against the bottom of the shaft 46, a spring 54 being arranged normally to urge the upper end of the lever 50 away from the eccentric strap 44. Upward movement of the rod 46 under the influence of the spring 54 is limited by a pin 56 carried by the rod 48 and arranged to abut the upper shoulder of a recess 51 in the eccentric strap 44. s

The shaft 40 is intermittently rotated to carry the machine through one complete marking operation by mechanism including a one-revolution clutch of a common type having an operating member 58 which is actuated by a treadle rod 60 to cause the shaft 40 to be rotated first through a half revolution, whereupon a pin 62 is moved axially to engage projections on the driving pulley (not shown) and is then automatically disengaged from the pulley so'that if the treadle is held depressed after the marking head I4 has been moved to press the work against the support 52, the marking head is thus held just as long as may be necessary to produce the required mark on the work. The release of the treadle rod 60 causes the reengag-ement of the clutch and the return of the marking head I4 to its starting position in which it is illustrated in Fig. 1.

The carrier 24 is held in abutting relation with the end of the slide 30 by a spring 64 (Fig. 2) extending between a swivel block 66 pivoted at the forward end of the lever 34 and a-collar 68 fixed to a shaft III, the shaft being pivoted to an arm 12 extending upwardly from the carrier 24. However, in order to prevent excessive heating of the slide 30, the carrier 24 is swung out of abutting relation' with the slide toward the end of its upward movement by a projection '54 on the frame H! which is adapted to engage an extension formed at the rear portion of the carrier 24.

The arm i2 is swung rearwardly by the operator, to move the marking head I4 to the typeresetting position, by means of a knob I6 pivoted at I8 (Fig. 5) to the arm 12 so as to operate a latch Bl) adapted to cooperate with a shoulder formed on a block 82 attached to the frame thereby to hold the carrier 24 in its retracted position. The spring 64 tends to resist this movement of the carrier 24 until the line of centers between shaft 28, the pin connecting arm "I2 and rod I0 and the pivot pin of the block 86 passes to the left of a line extending between shaft 28 and the pivot pin of the block 66, and thereafter the spring 64 tends to move the carrier into its retracted position. Thus, by grasping the knob 16 and moving it backwardly the marking head I4 may be swung upwardly and forwardly from its starting position over the work support I2 into a position in which the type are in a convenient position to be seen and interchanged by the operator and yet are gravitationally held in the head because of its inverted position.

The marking head I4 is provided with a plurality of slots 84 (Fig. 4) adapted to receive type pieces which are normally held together within the slots by plungers 86 which extend through the sides of the marking head and are normally urged inwardly by means of springs 88 to clamp the type. The plungers 85 may be moved away from the type to unclamp them by means of levers 90 adapted to engage shoulders on the plungers 86 and pivotally connected by screws 92 to the marking head I4. The levers 98 are automatically swung to unclamp the type when the marking head I4 is moved into its type-resetting position by being moved into engagement with wedge projections 94 fixed at the forward ends of arms 96 secured to the front portion of the frame I0. Thus, although the type do not tend to fall out of the marking head I4 in its elevated position, they are free to be removed from the slots 84 and replaced by other type which, for the convenience of the operator, may be kept in a rack 98 fixed to the top of the frame Hi just above the marking head when in its type-resetting position.

The marking head I4 is locked in the carrier 24 by a latch 98 (Fig. 2) mounted to swing on the left-hand end of the shaft 28 and is normally urged into engagement with the base of the marking head I4 by a spring I 80 the ends of which are received in holes in the arm 12 and in another arm carrying a handle I02 integral with the latch 98.

Whenever the marking head I4 is swung into its type-resetting position, starting of the machine is prevented by means comprising a cam I04 (Fig. 1) fixed to the right-hand end of the shaft 28 and arranged to engage a roll I I16 on one arm of a three-armed lever I 88 rotatably mounted at IIG on the frame ID. The lever I08 is thus swung in a counterclockwise direction (Fig. 1) and causes a stop H2 pivoted at II4 to i the frame to be swung into the path of an overhanging portion of a member H6 which is pivotally connected to the trea-dle rod 60 at I I8. The upper ends of the lever I08 and stop H2 are connected by a link I having a slot I22 adapted to receive a pin. I24 fixed to the stud H2 whereby the stop is permitted to remain in its operative position, until removed therefrom by the operator, even though the marking head l4 may have been returned to its starting position.

Provision is made in the illustrated machine for controlling the marking strip I8 so as to prevent the engagement therewith by the marking head I4 as the latter is being moved to the type-resetting position as well as for moving that portion of the strip directlyover the work support I2 into proximity to or engagement with the work, and into a position of parallelism with the marking head I4 when in. its work engaging position, before the strip is engaged by the head. Rearwardly of the work support I2 the marking strip I6 passes under a roll I26 mounted on a bracket I28 fixed to the frame ID to hold the strip at such a height as toaccommodate any thickness of work likely to be operated upon by the .machine; The strip I 6 :iSl led. forwardlygunder.

they roll I26 in; a: direction inclined :upwardlyatoe ward: thefront .of:the machine at a substantial angle so. aswnotto ,obstructwthe operators vision OfflJhEwWOI'knOl'l lthevsupport I2 and to. facilitate.

positioning ofthework .onrthe support against thewpins 2 I1 from the marking head I4 by a member. which pivot point acts both as aguide. and. guard,i.this. member comprising an .arm .136; the: upper. end of :which isislotted. to receive agblocksI32-:pivoted.:to the forwardend .of thelever 34.. The strip I6=.:at its forward end;,is stored onaholderin;theform of a reel. I34 carried by. a. spindleuI36 :mounted in the: forward endlofian. arm: I38;.ther:arm being mounted toswing downwardly fora apurpose to bedescribed. below. about a pivot I46 on the.

frame I 0. An arcuate. plate: I 42 adaptedzto. be:

engaged by .the strip; I6 .is. fixed: to the lowerportion of the. arm I30;and1 is. provided with a pair of laterally adjustable'guides I44: adapted. to. .po.=-

sition the striplaterally of the plate. I42:.in.en-

formity in the application ofboth heat and pressure to the strip.. The arm. I3ll1'is thus .operated by alever.l46 the forward :end of 'whichrisslotted toreceive astud .I48lcarried by-th'e arm 1 I36 and. which is fulcrummed at IIlton thelupper-end of as support I621.fixed.to the frame Illx. A.spring.;l54= connecting the. rearmostend .of-ithe lever. Mfinand thearm I38ils arranged to urge them both towardtheir uppermostipositions. The lever I46.

is operatedto move the guide plate..l42, as. de-

scribed a'bove, by vertical movement of the mem-. ber II6 whichhasfixed to its.upper end a stud i561the upper end act which .is slotted .to receive a pin I58lfixedto the lever. I46;v As .the arm.l3fla is lowered its mid-portion is gradually moved": rearwardly of the machine under the influence of asp ring lfill connecting the arm withathe levers 146 in order to minimize. the. tendency. of :the.

guide plate. I42xto be swung outwardly aswthe.

chine. This inward movementpf the arm :I3Ilis controlled audits-downward movementiis' limited by a cam I62 fixed to the frame lflalandhayingau rearwardly inclined. surface terminating me hooked portion I64 which is. engaged byma'rroll:

I66 mounted on" the arm.I3l1.: It willnow be ap.-. parent that'as the arm Iis11oweredzthe cam I62 permits the arm to-swing rearwardlyuntil -the'ro1l I66;strikes the hook I645 whereuponthe. movement ofthe arm is arrested, the lowerredgea of the guide plate .I421n0w beingatsubstantially the level of the work support I2 and.;cooperatingwith the roll I26'lto hold the strip against'theiwork piece on. the support. movementrof the arm curs prior to arm- I30 as described above, the clutch -is-tripped by the operating member 58, causing the mark The I strip; I 6 1 is; thus supported in. front :of :the work support I ZLan-d is: held .away

I48 swings rearwardly of the.-ma-= The aboveementioned. I30 and marking strip, octhe movement of the l marking heads. I4 into engagement with the'strip so that al-l oiz, the type characters in thelmarking head will en ing head toqbe loweredto its marking position. Shortly after the arm I3Ilshas been moved tothe bottom of its stroke by the operation of the treadle rod 60, this movement of the arm being limited by the seating of the roll I66-against the hook I64, the downward swinging of the forward. end of the lever,34 causes the block I32.to. engage the upper end ofa spring I61 -mounted in a recess in the slotted portion of the arm. I30. Thereafter, thespring I6'Iyields in' response to further downward movement of the marking head and'holds the roll I66 against the hook I64 until the marking head is retracted.

The changing. of type in the marking head I4 is facilitated not only by swinging the carrier 24 into such a position thatthe. head is conveniently located for the purpose in question but also because the guide plate I42 and the reel 834 are moved out of the line of vision to the marking. head, as illustrated in Fig.v 3, while the head is in the type-resetting position as willnow be. de-

scribed. As the carrier 24 is swung forwardly and upwardly in the manner referred to above,

marking head I4 by a'link I68 which connects the arm I38 to the lower end of the lever I68 Simulin its upper end adaptedto receive a stud II2 carried by an arm I'M extending rearwardly'irom the upper portion of the arm I36.

The marking strip I6 is led rearwardly from the roll 526 (Fig. 2) between a pair of feed rolls I16; I18, the latter of which is rotatably mounted on a shaft lfiil'fixed to the frame it and has arubber covered periphery againstwhich the strip isryieldingly held by the roll I76. The roll I16 is rotatably mounted onan arm'I82 arranged to pivot on the frame iii about an axis whichis eccentric with respect to the roll 1116 so that by swinging the arm I82 rearwardly the roll Ii-Sis moved away from the roll M8 to facilitate inserting afresh marking strip in the machine. A spring I64-tends to swing the arm I82-so as to hold the strip li-iin engagement with the roll I I3 which is operated intermittently once for each actuation'of the marking 'head I42 The mechanism for thus operating the roll IItibomprises a ratchet I86 associated with the roll H6 and lever I88-in one arm of which is mounted a pawl I90 adapted to engage the ratchet I86. Tothe the arm I38is swungdownwardlyto carry the reel 134' well below the resetting position of the N other arm ofth'e lever 88 is pivoted a link I92" which is driven from a crank pin I94 (Figs. '2 and 6) extending-through a sleeve I95to which the link I92 is connected, the pin being mounted for adjustment radially with respect a drunr I96 fixed tothe end of the shaft 46. The head of the pin I94 is received in a radial slot iQBin the drum'I96 and an arcuate slot 200 in a disk 262$ rotatably mounted on a screw 263 threaded in the drum. By-turning the disk 202 the pin I94 is moved to any desired position of adjustment in the slot I98, in which position the pin is adapted to be clamped by a nut 204 threaded thereon and arranged to bear against thesleeve. I 95. p The strip. I6 .passes from the. rolls I16, I16; under a: guard plate 2Il6ifixed bytascrewlllil to theirame- IIlto a rewinding reel 2H] having a diskZIZ which isarranged frictionally to. engage the peripheryof thewdrum I96;

The real. 2H! is: rotatably: mounted onan: 1 arm 1-21 4 pivoted i at 1.21 6 to. l the 1 frame I0 and yieldingly urged by a spring 2I8 so as to hold the disk 2| 2 against the drum I96, as described above.

The operation of the machine will now be briefly summarized. Upon treadling the machine the rod 60 and the member I I6 are lowered, causing the arm I 30 also to be lowered by the connections described above so as to move the portion of the strip I6 beneath the marking head I4 downwardly toward the work support from its starting position illustrated in Fig. 1. This downward movement of the arm I 30 is limited by the cam I62, the hooked end of which, I64, is engaged by the roll I66 when the bottom edge of the guide plate I42 is moved to substantially the level of the work support I2. Following the above described operation of the arm I30, the clutch is tripped to cause the marking head I 4 to be moved toward the work support I2 upon which a work piece will have been placed in engagement with the guide pins 20. The marking head I4 is thus moved into engagement with the strip I6 and holds the strip against the work piece as long as the treadle rod 60 is held down. Upon release of the treadle rod 60 the clutch is actuated to cause the return of the marking head I 4 to its starting position and also to return of the arm I30 to its uppermost position, as illustrated in Fig. 1, in which it is to be noted that the marking strip I6, although held out of engagement with the marking head I4 by the guide plate I42, is nevertheless inclined upwardly at a substantial angle toward the front of the work support so as to provide good visibility of, and access to, the work support.

When it is desired to interchange the type in the marking head I4, the knob I6 is moved rearwardly until the latch is operatively engaged with the block 82, thereby holding the marking head in the type-resetting position in which it is illustrated in Fig. 3. In this position the head is well above, and hence clearly visible over, the plate I42. Toward the end of this movement of the marking head the levers engage the projections 94 and are moved outwardly to retract the plungers 86 from engagement with the type in the slots 84. The type are thereby unclamped and are free to be removed but are gravitationally held in the head. As the head is swung toward its type-resetting position, the cam I04 actuates the lever I08 to cause the arm I38 to swing downwardly to such an extent that the reel I34 is disposed below the marking head out of the line of the operators vision thereto. This movement of the arm I38 also causes the arm I30 to swing forwardly so as to prevent the marking head from engaging the strip I6.

Upon swinging the marking head I4 away from the type-resetting position, the type are automatically reclamped as soon as the levers 90 move out of engagement with the projections 94 and then the arms I38 and I30 are returned again to the positions in which they are illustrated in Fig. 1.

Having described our invention, what we claim as new and desire to secure by Letters Patent of the United States, is:

1. In a marking machine, a work support, a marking head arranged to receive type and comprising a heating member adjacent to said type, an operating member mounted for movement toward and away from said support, said marking head being mounted to swing on said operating member about an axis remote from said heating member, a yielding member arranged normally to hold said marking head in abutting relation with said operating member, and means for swinging said marking head out of abutting relation with said operating member as the latter is moved away from said support whereby the amount of heat transmitted from the marking head to the operating member is reduced when the head and member are removed from the support.

2. In a marking machine, a work support, an operating member mounted for sliding movement toward and away from said support, a guide for said operating member, a marking head mounted on said operating member for movement into and out of abutting engagement with the member, said marking head comprising a heating member, and means for moving said marking head out of abutting relation with said operating member as the latter is moved away from the support thereby preventing overheating of the operating member and binding between the operating member and the guide.

3. In a marking machine, a work support, an operating member mounted for movement toward and away from said support, a marking head arranged to receive type and comprising a carrier mounted for movement into and out of abutting relation with respect to said operating member, and means operated by movement of said operating member away from said support to move said carrier out of abutting relation with said operating member.

4. In a marking machine, a work support, an operating member mounted for movement toward and away from said support, a marking head arranged to receive type and mounted on said member for movement into and out of abutting relationtherewith, means'mounted and arranged normally to hold said head in abutting relation with said operating member, and means operable as said member is moved away from said support to move said head out of abutting relation with said operating member.

5. In a marking machine, a marking head adapted to receive a plurality of type, clamping means carried by said head and arranged normally to hold the type releasably clamped therein, a clamp controlling member operable to unclamp the type, said marking head being mounted for movement away from its starting position to facilitate the resetting of type, and means cooperating with said controlling member when said head is moved out of its starting position to unclamp the type.

6. In a marking machine, a marking head having type removably mounted therein, said head being mounted for movement into a type-resetting position to facilitate changing the type, type clamping plungers mounted in said head, a lever for operating said plungers, and a member cooperating with said lever when said head is moved into said position to cause said plungers to release the type.

7. In a marking machine, a marking head having type removably mounted thereon, means for heating the type in said marking head, said head being mounted for movement into a type resetting position to facilitate changing the type, type clamping means slidably mounted in said head, a lever mounted on said head for overcoming the resistance to movement of said clamping means, which resistance may be increased when the clamping means is heated by the type, and a member co-operating with said lever when the head is moved into type resetting position to cause "the" automatic release of the type-by the clamping means.

"8 In a marking machine, a marking head adapted to receive type andmounted for movevision to said head, and means for moving said holder-out of the line of vision to'said head as "the latter is movedinto its resetting position.

9. In a marking machine, a type head mounted for movement between a starting position and a type-resetting position to facilitate the Changing of type, a holder for a strip of marking material adapted to be pressed against the work by said head, and means for moving said holder below said type head as the latter is moved into its resetting position thereby to render said type head accessible for the changing of type.

10. In a marking machine, a marking head adapted to receive a plurality of interchangeable type, said marking head being mounted for movement into a type-resetting position, a holder for a marking strip, said strip normally being directed in front of said marking head, and connections operated by movement of said marking head toward its resetting position for lowering said holder and strip below said marking head when in its resetting position.

11. In a marking machine, a type head mounted for movement from a starting position into a type-resetting position, a holder for a marking strip, a guide for said strip, and means actuated by movement of said head toward its resetting position for moving said holder and guide into positions out of the line of vision to said head in its resetting position.

12. In a marking machine, a type head mounted for movement from a starting position into a type-resetting position to facilitate the changing of type, a holder for a marking strip, a guide, said holder and guide being mounted to swing into positions below the type-resetting position of said head, and connections operated by movement of said head toward its resetting position for operating said guide and holder.

13. In a marking machine, a type head having type removably mounted therein, a guide, means for swinging said head into a position above said guide to facilitate the changing of type, a holder for a marking strip disposed normally above said head and mounted to swing below the said position of said head, cam means for operating said holder, and connections actuated by movement of said holder for moving said guide away from said head as said head is moved toward said position.

14:. In a marking machine, a work support, a marking head, a marking strip disposed between said head and support and inclined away from said support toward the direction from which a work-piece is placed between said support and head, operating means for relatively moving said head and support to press said strip against the work-piece, a guide engaging said strip and movable to carry said strip into proximity to the work-piece, and operator-controlled means constructed and arranged successively to operate said guide and actuate said operating means.

15. In a marking machine, a work support, a marking head, means for supporting a marking strip directed between said support and head and inclined away from said support toward the front thereof, a guide arranged to engage said strip and mounted for movement toward said support, means for operating said head to press said strip against a Work-piece on said support,

andmeansfor successively moving said guide to carry said strip in proximityto the workpiece on said support and for then actuating said operating means.

16. In a marking machine, a work support, a

marking head,zmeans'for supporting a marking strip extending between said support and head and inclined away from said support toward the front thereof, said means comprising a guide mounted for movement toward and away from "said support, operating -means for relatively moving said support and head to cause said strip to be pressed against a work piece on said support,

connections between said operating means and guide'formoving the latter toward said support, andmeans for'limiting the movement of said guide toward said support.

17. In a marking machine, a work support, a marking head, means for supporting a marking strip extending between said support and the head and inclined away from said head toward the rear thereof, said means including a guide mounted for movement away from said head to move said strip into a relation of parallelism with said head, means for relatively moving said head and support to press said strip against a work piece on said support, means for operating said guide, and means for limiting the movement of said guide away from said head when said strip and head are parallel to each other.

18. In a marking machine, a work support, a marking head, means for supporting a marking strip over said support and inclined away therefrom toward the front thereof, said means including a member mounted and arranged normally to hold said strip away from said head, means for moving said member away from said head to position a portion of said strip over said support parallel to said head, and means for relatively moving said head and support to cause said strip to be pressed against a work piece on said su port.

19. In a marking machine, a work support, a marking head, means for supporting a marking strip over said support and inclined away therefrom toward the front thereof, said means comprising a member mounted for movement to position a portion of the. strip over said support parallel to said head, means for moving said member away from said head, and means including a cam mounted and arranged successively to guide said member as it is moved away from said head and then to limit the movement of said member away from said head when said strip is parallel to said head.

20. In a marking machine, a work support, a marking head having type removably mounted therein, operating means constructed and arranged to move said head and support relatively to each other in one direction to apply pressure toa work-piece disposed therebetween, said head being mounted for movement in another direction into a resetting position to facilitate the changing of type therein, and means mounted and arranged to utiiize the last-mentioned movement of said head toprevent the actuation of said operating means.

21. In a marking machine, a work support, a marking head having interchangeable type there in, operating means constructed and arranged to move said head and support toward each other to apply pressure to a work-piece disposed therebetween, means for moving said head away from said support into a type-resetting position to iacilitate the changing of type, an operator-controlled member for actuating said operating means, a stop, and connections between said lastmentioned means'and stop mounted and arranged to move the latter into the path of movement of said member when said head is moved into its resetting position thereby to prevent said operating means from being actuated.

22. In a marking machine a work support, a marking head having type removably mounted therein, operating means for moving said head in one direction to press a work-piece on said support thereagainst, means for moving said head in another direction away from said support to facilitate the changing of type, an operator controlled member for actuating said operating means, and means operated by the last-mensaid member when said head is in its resettingposition thereby to prevent said operating means from being actuated.

REGINALD BOYD WOODCOCK. SYDNEY WHITE POTTER. 

